You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Catherine Young.

ASSISTANT: Catherine Young. How can I assist you?

USER: Will you help me in booking the flight ticket from OAK to PHL?

ASSISTANT: Can you provide me with the travel dates?

USER: My travelling dates are Apr 28 and Apr 30.

ASSISTANT: Do you have any class preferences?

USER: No, thank you for asking.

ASSISTANT: Is there any time concern.

USER: I need a direct flight which departs in evening time.

ASSISTANT: Are there any airline preferences?

USER: No, I am comfortable in any airlines.

ASSISTANT: Are there any other preferences?

USER: No, thank you for asking.

ASSISTANT: Give me a minute.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to inform that there are no flights on your desired dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.