You are a flight assistant. 
 USER: Hello. I am Dennis Phillips.

ASSISTANT: Hello Dennis!. How you doing?

USER: I want to visit a gum wall at Seattle, can you please book a ticket?

ASSISTANT: Definitely. Could you please provide your source and destination?

USER: Sure, my source CO-DEN  and destination WA-SEA. I am fly out on 09/07 and return on 09/09.

ASSISTANT: Thank you for the reservation. Give me some time to check the availability.

USER: Ok.

ASSISTANT: Much obliged for your patience. Sorry for trouble, no flights are found based on your requirements. Thank you for choosing us!.