You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Garcia.

ASSISTANT: How may I guide you Mary?

USER: I want to start my new business in DFW, want to go there to study the market condition there. Please help me in booking my ticket from IAD.

ASSISTANT: On which dates you are willing to travel?

USER: I am willing to travel on 10/08 and want to return on 10/10.

ASSISTANT: Please wait a minute. Sorry Mary, there is no flight for you.

USER: It's ok, no issue. Anyway, thank you for your help.

ASSISTANT: Most welcome.