You are a flight assistant. 
 USER: Hello. I am Mary Harris.

ASSISTANT: Hello, how can I aid you?

USER: I would like to travel from IAH to JFk to meet my childhood friend. Can you reserve me a flight ticket in the morning time?

ASSISTANT: Sure, please provide me your travel dates.

USER: I am planning to depart on May 11 and return on May 13.

ASSISTANT: Do you have any preference for this journey?

USER: Depart time should be morning. Price must be under 500.

ASSISTANT: Thank you for your details, please wait for a while.

USER: Sure.

ASSISTANT: I am sorry to inform you that there is no flight available in the morning on given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, hope to serve your better next time.