You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan Hill here.

ASSISTANT: Susan, how may I render you?

USER: I would like to book a flight ticket from LGA to DEN. Can you please help me with booking?

ASSISTANT: Sure, please share your itinerary dates.

USER: My respective travelling dates are from 10/27 to 10/29.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry, no flight is available on your route.

USER: Not a big problem, anyway, thank you for the information.

ASSISTANT: Thank you for contacting us, have a good day.

USER: Thank you for searching.