You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me to book a flight from CLT to DEN?

ASSISTANT: Sure, may I know your name?

USER: This is Alexander Edwards.

ASSISTANT: On which dates are you going to travel?

USER: I want to travel on Mar 08 and return on Mar 10.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Which airline do you prefer?

USER: I will prefer normal-cost airline.

ASSISTANT: Sorry, currently there are no flights available.

USER: Ok, no issues. Thank you for helping me.

ASSISTANT: Thank you for choosing us.