You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: Please reserve a seat with my name Katherine Lee.

ASSISTANT: Sure, May I know the journey codes?

USER: New York, LGA to Chicago, ORD, are my locations to travel.

ASSISTANT: Please help me with your travel dates.

USER: I am going to meet my grandmother on her 100th birthday on 09/05. I will arrive on 09/07.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: Ok. Thank you for the valuable information.

ASSISTANT: Thank you for reaching us.