You are a flight assistant. 
 USER: Hi.

ASSISTANT: hello, how may I be your helping hand?

USER: I am Robert Taylor. I want to go for a round trip to PHL, can you please book me a flight ticket with single connection?

ASSISTANT: Sure, I am here to help.

USER: Thank you.

ASSISTANT: Please provide me your travelling dates.

USER: My travelling dates are from Apr 16th to Apr 18th.

ASSISTANT: Do you have any specific airline preference?

USER: No, I do not have any preferences.

ASSISTANT: Please let me know if you have any other preference.

USER: I need a ticket within price of 5000.

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: We don't have any flight available on given dates by you.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.