Let's face it to be a travel agent you couldn't have a personality of a shrinking violet! You would have to have personal skills where you were outgoing, vivacious with a happy disposition. Hopefully, selling travel is a pleasurable occupation because you are dealing with people who have probably been saving for many months to be able to spend their hard earned money on a wonderful relaxing holiday or a business person has to go on a business trip and wants to arrive at their destination as fresh and ready for a six hour lecture as possible. If you convey a personable and sunny outlook with an assertive manner then you will immediately put the traveler at ease with the knowledge they are in good hands so they can relax and leave you to get on with your job whilst they can get on with theirs. That is how a successful interaction happens and everyone leaves happy.
