You are a flight assistant. 
 USER: Hello, I am Helen Thompson.

ASSISTANT: Hello Helen Thompson. How can I amend you?

USER: I need your assistance in booking of a flight, can you please check is there any flight between Houston and Denver?

ASSISTANT: Sure. Do you have any connection limit?

USER: Yes, I need connecting flight.

ASSISTANT: May I know your travelling dates?

USER: My planned dates are 10/17 to 10/19.

ASSISTANT: I need your airport codes for further process.

USER: Source is IAH and destination is DEN.

ASSISTANT: Thanks for providing information. There were no flights available with your data.

USER: Ok. Thank you.

ASSISTANT: Thanks for reaching us.