You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Catherine Roberts.

ASSISTANT: Ok.

USER: I want to book a flight ticket from SFO to IAD, can you please help me in flight booking?

ASSISTANT: Sure, please share your travelling dates.

USER: I want to fly on 05/22, return on 05/24.

ASSISTANT: Do you need any halt in between the journey?

USER: Yes, I need a halt.

ASSISTANT:    Do you have any other requirements?

USER: I need a economy class.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry we didn't find any flights with your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.