You are a flight assistant. 
 USER: Hello. My name is Jacob Harris.

ASSISTANT: Hello, How can I serve you?

USER: I would like to attend Bio exhibition at Seattle. Can you help me in booking a flight ticket with in the price of 5000?

ASSISTANT: Sure, May I know the journey codes?

USER: I want to start my journey from DFW to SEA.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are from 07/11 to 07/13.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.