You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am David Lopez, can you help me to book a flight ticket from IAD to CLT?

ASSISTANT: I am here to help you, can you please provide your planned dates of journey?

USER: Ok, my travel dates are 01/13 and 01/15.

ASSISTANT: Sorry to say this Lopez, there are no flights which can travel your route.

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: Most welcome, thank you for reaching out here.