You are a flight assistant. 
 USER: Hi, I am Edward Davis.

ASSISTANT: Hello, how can I help you today?

USER: After a long time, I need to meet my childhood friend on 07/19, so could you please help me in booking a ticket?

ASSISTANT: Sure, I am mirthful to help you. May I know your other travelling date?

USER: I intend to return on 07/21.

ASSISTANT: Kindly mention your airport codes?

USER: My airport codes are ORD and BOS.

ASSISTANT: Do you have any other specifications?

USER: Price should be below 500.

ASSISTANT: Sorry for the inconvenience caused, currently no flights are running to that locations due to some technical issues.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for choosing us, have a good day.