You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you please book a flight ticket from PHL to DEN?

ASSISTANT: Sure, can you please help me with your name?

USER: I am Betty Collins.

ASSISTANT: Thank you. May I know your travel dates?

USER: My trip is in Nov from 9th to 11th.

ASSISTANT: Ok, is there any class preference?

USER: No. I am fine with any class.

ASSISTANT: Ok, please stay online for a while.

USER: Please make sure that my depart time is in morning. I want to travel in well known airlines only.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: I need a single connecting flight. Can you please check again with all my requirements?

ASSISTANT: I am sorry, there is no flight available as per your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome and have a nice day.