You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi. Hoe may I help you?

USER: Myself Joshua Campbell. During holidays I love to spent some time with my parents in Los Angeles, so could you please book a ticket from PHL to LAX?

ASSISTANT: Sure, may I know your planned dates?

USER: I would like to fly on 07/06 and return on 07/08.

ASSISTANT: I am sorry to say, no flights are available on your dates.

USER: That's ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Welcome.