You are a flight assistant. 
 USER: Hi, I am Robert Hall.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket to Philadelphia  with price under 200. Can you please help me with it?

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

USER: Travel dates are 09/01 and 09/03.

ASSISTANT: Ok, could you help me with your journey codes?

USER: Airport codes are IAH-PHL.

ASSISTANT: Wait a minute please.

USER: oK.

ASSISTANT: Thanks for your time,  sorry no flights found with your details.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us, have  a nice day.

USER: Thanks for the help.