You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to travel from IAH to PHL. Can you please help me with the booking?

ASSISTANT:  May I know your travelling dates?

USER: I want to travel on Apr 7 and need to return on Apr 9.

ASSISTANT: Do you prefer connecting flight?

USER: I need a flight with single connection.

ASSISTANT: Do you have any other specifications?

USER: I prefer an economy class to travel.

ASSISTANT: May I know your good name?

USER: Linda Lee here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your travel dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.