You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Alexander Wilson. Actually, I tried to book the flight ticket but at the payment stage I am getting a problem. Can you please help me to book a flight ticket from DTW to SFO?

ASSISTANT: Sure, please share your travel dates.

USER: My travelling dates are from 07/08 to 07/10.

ASSISTANT: Sorry, I did not find any flights for the given schedule.

USER: Oh! It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.