You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Campbell.

ASSISTANT: Marry Campbell. How can I help you?

USER: Can you reserve a seat for me in a flight from DEN to PHL?

ASSISTANT: Sure, can you provide me the travel dates?

USER: Ok, my journey dates are from Apr 08 to 10.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: May I ask you for any other preferences?

USER: I don't have any specifications.

ASSISTANT: United Airlines with flight 1010 is providing service on your route.

USER: Please confirm it.

ASSISTANT: Your ticket is book in the economy class with cost of 100.

USER: Thanks for your help.

ASSISTANT: Thank you for approaching us.