You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Lisa Roberts.

ASSISTANT: Lisa Roberts, how may I aid you?

USER: I am planning to travel from IAH to DEN, help me in booking a flight?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My travelling dates are 01/12 to 12/14.

ASSISTANT: Do you have any specifications?

USER: I want direct flight.

ASSISTANT: Please provide your exact travel dates.

USER: My travel dates are 01/12 to 01/14.

ASSISTANT: Please give me a moment to check for available flights.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.