You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Virginia Mitchell here.

ASSISTANT: How may I help you?

USER: I want t travel from LGA to DEN. Please help me in ticket booking.

ASSISTANT: Sure, please provide me your journey dates.

USER: My travelling dates are from 03/27 to 03/29.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: There are no flights available at this moment, Virginia.

USER: It's ok. Thank you .

ASSISTANT: Thank you for choosing us.