You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Jack Martinez. I need to book a ticket from IAD to meet my friend who is well settled in DFW. Could you please help me in doing that?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates 03/27 and return on 03/29.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform that no flights are available with your given information.

USER: No issues, thank you for your information.

ASSISTANT: Thanks for choosing us.