You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: can you help me in reserving a ticket from IAD to IAH?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling journey dates are Aug 10 to 12.

ASSISTANT: Do you have any class specifications?

USER: I need economy class.

ASSISTANT: May I know your name for the documentation purpose?

USER: I am Deborah Phillips.

ASSISTANT: Do you have any another specifications on this journey?

USER: I need a single connecting flight.

ASSISTANT: Unfortunately, no flights available on your requirements.