You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Gregory Johnson. I a have plane to by a house at Houston, can you please book me a ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: My journey codes are from EWR to IAH.

ASSISTANT: Please help me with your travel dates.

USER: I would like to fly on 02/09 and return on 02/11.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok. No problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.