You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Emma Young.

ASSISTANT: How may I guide you?

USER: I need to attend a business meeting with my clients at Charlotte, can you please help me to book a flight ticket from DEN to CLT?

ASSISTANT: Emma Young, I am willing to help you for this. When would you like to travel?

USER: Sure, my itinerary dates are Apr 29 and May 01.

ASSISTANT: Do you prefer any airlines?

USER: I am comfortable with any airline to travel.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to intimate, no flights are found with your criteria.

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

ASSISTANT: Thank you very much for reaching us.