You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Barbara Thomas here.

ASSISTANT: Yes, Thomas.

USER: I want to travel Seattle to have a client meeting there.Can you help me to book a flight ticket from Washington DC - DCA?

ASSISTANT: Sure, please provide me your destination?

USER: My destination code is WA - SEA.

ASSISTANT: Please, share me your travelling dates?

USER: My travelling dates are 07/22 and 07/24.

ASSISTANT: I checked with your request, no flights are there in your route. Thank you for reaching us.

USER: Its ok.I will go with another. Thank you for the information.

ASSISTANT: Ok, welcome.