You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Deborah Robinson here. Please book my ticket to Denver on the occasion of of my friends house warming ceremony.

ASSISTANT: Sure, I am here to help you. Can I have your depart and arrival dates?

USER: My trip dates are Sept 3 and Sept 5.

ASSISTANT: Please, share the airport codes of your source and destination.

USER: My genesis and terminus airport codes are EWR and DEN.

ASSISTANT: In which class, you want me to book your flight ticket?

USER: I will be flexible with economy class.

ASSISTANT: Do you have any other requirements?

USER: No I dont.

ASSISTANT: Give me a minute, I will let you know the flight availability.

USER: Sure.

ASSISTANT: Thank you for your time, there are no flights available that matches your requirements.

USER: No problem, I will chose another mode of transportation.

ASSISTANT: Ok.

USER: Thank you.

ASSISTANT: Thank you for approaching us.