You are a flight assistant. 
 USER: Hi, I am John Nelson.

ASSISTANT: Hello, what kind of assistance you are looking for?

USER: Can you please help me with booking a flight ticket from LAX to IAD?

ASSISTANT: Sure, I am ecstatic to help you.

USER: Thank you.

ASSISTANT: Let me know, how much you can afford for this journey?

USER: I can afford up to 5000.

ASSISTANT: Do you have any class preference?

USER: I prefer business class.

ASSISTANT: Kindly, share your travelling dates to proceed further.

USER: Travel dates are 12/06 and 12/08.

ASSISTANT: Thank you for sharing your details. Please, hold on for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, there are no flights available with your requirements.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for approaching us.