You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Dorothy Lopez here. I would like to book a ticket from DEN to HOU, can you please help me with that?

ASSISTANT: Sure, may I know when are you planning to make your trip?

USER: The travel dates are from 01/27 to 01/29.

ASSISTANT: Ok, please give me a moment.

USER: I want a direct flight.

ASSISTANT: We are unable to provide any direct flights on your route at this moment.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.