You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Davis.

ASSISTANT: How may I assist you today?

USER: I want to book a flight ticket, can you help me with that?

ASSISTANT: Sure, please provide me your travel dates.

USER: I am planning to travel on 12/26 and return date is 12/28.

ASSISTANT: Can I know your airport codes?

USER: My source and destination is LAX to DEN.

ASSISTANT: Give me a minute.

USER: Make sure my connection limit is 0. Sure, take your own time.

ASSISTANT: Sorry, I cannot find any flights with your travel dates.

USER: That's fine.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your help.

ASSISTANT:  It's our pleasure to help you.