You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rebecca Campbell here.

ASSISTANT: How may I help you today?

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

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: My itinerary dates are 02/21 and 02/23.

ASSISTANT: Can you please provide your source and destination codes?

USER: My airport codes are IAH and CLT.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found.

USER: No problem, thank you.

ASSISTANT: Thank you.