You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to book a flight in Major Airlines to reach Chicago?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My planned dates are on Mar 10th to 12th.

ASSISTANT: Can you share me your nearest airport codes?

USER: Sure, my airport codes are SEA - ORD.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: No worries, thank you.

ASSISTANT: Can I know your name?

USER: Sure, my name is Helen Williams.

ASSISTANT: Thank you for contacting us.