You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Jennifer Williams. I want to attend my nephew's wedding at Philadelphia, PA - PHL. Please help me to book a ticket.

ASSISTANT: Sure.

USER: I want to start from Austin, TX - AUS on 04/18 and have to return on 04/20.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. We found that no flights are there, that matches with your details. Thank you for contacting us.

USER: Ok, no issue. Thanks for your response.