You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Deborah Baker.

ASSISTANT: Ok.

USER: I would like to go for NASA Space centre to attend technical project. Can you please book a ticket on 07/24?

ASSISTANT: Sure, I am here to render you. Could you please help me with your travelling airport codes?

USER: Source code is Detroit, DTW and Landing point is Houston, HOU.

ASSISTANT: When you are willing to return from HOU?

USER: I will return on 07/26.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: No problem.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you.