You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Deborah Young.

ASSISTANT: Hello Young.

USER:  I want to meet my childhood friends.I would like to book a ticket.

ASSISTANT: That's really special trip, would you like to share airport codes?

USER: My airport codeSsare ORD to IAH.

ASSISTANT: Ok, please share travel dates.

USER: I would like to travel on 07/11 from LAS and return on 07/13 from OAK.:. Sorry.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Sorry Young, there is no flight found in my database.

USER: That's fine.

ASSISTANT: Thank you for approaching us.

USER: Thank you for taking time to speak with me.