You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: I want to travel from DFW to ORD.

ASSISTANT: Can I know your travel dates?

USER: I want to travel on May 3 and May 5.

ASSISTANT: May I know your name to proceed further?

USER: Sandra Campbell here.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your preferable travel dates.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.