You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: I am Samantha Martinez.

ASSISTANT: How may I help you?

USER: Can you help me to book a flight with 1 connection to DEN?

ASSISTANT: Samantha, I am here to help you with this. Can you please share me your airport codes?

USER: My preferred source airport code is IAD.

ASSISTANT: When would you like to travel?

USER: My travelling dates are 06/27 and 06/29.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Samantha sorry for inconvenience, no flights are available with your criteria.

USER: No issues, thank you for your time.

ASSISTANT: Thank you Samantha for utilizing our agency.